Adjustable roller carrier

Abstract

Disclosed is an adjustable roller carrier, comprising a roller carrier base ( 1 ), rollers ( 2 ) and a motor speed reducing driver, wherein both ends of the roller carrier base are each articulated with a roller bearing ( 3 ) and a roller carrier hydraulic jack ( 5 ), with the roller carrier hydraulic jack ( 5 ) being articulated with the roller bearing ( 3 ) and the roller ( 2 ) being mounted on the roller bearing. The roller carrier hydraulic jack and a hydraulic pump station thereof, and an electromagnetic valve are all placed inside a hollow roller carrier support so that not only the height and the center-to-center distance of the rollers are adjustable, but also the adjustable roller carrier has the advantages of being integrally compact in structure, and small in terms of occupied space. The adjustable roller carrier enables the steel pipe to rotate in a narrow space, can be fast lifted, and transported by railway. The adjustable roller carrier is convenient to operate and has high safety.

What is claimed is: 
     
       1. An adjustable roller carrier, comprising: a hollow roller carrier base having opposed ends and an upper surface, wherein the upper surface of the hollow roller carrier base comprises a concave arc from a middle of said roller carrier base to each of the opposed ends a roller at each of the opposed ends of the hollow roller carrier base; and a motor speed reducing driver, wherein: each opposed end of the hollow roller carrier base includes a roller bearing and a roller carrier hydraulic jack, the roller bearing being connected to the hollow roller carrier base by a first shaft, each of the roller carrier hydraulic jacks is connected to a first end of a corresponding roller bearing by a second shaft and to the hollow roller carrier base and is configured to rotate the roller bearing around the first shaft, and each of the rollers is mounted on a second end of a corresponding one of the roller bearings, the first shaft (i) being spaced apart from the second shaft and the roller and (ii) functioning as a hinge for rotating the roller bearing, and the adjustable roller carrier is movable and adapted for welding and transportation of steel pipes in a restricted space. 
     
     
       2. The adjustable roller carrier according to  claim 1 , wherein each of said roller bearings comprises a triangular articulated structure. 
     
     
       3. The adjustable roller carrier according to  claim 1 , wherein said adjustable roller carrier is a driving roller carrier, and said adjustable roller carrier further comprises a driving roller rotation motor that drives at least one of the rollers. 
     
     
       4. The adjustable roller carrier according to  claim 1 , wherein each of said roller carrier hydraulic jacks is inside the hollow roller carrier base and includes a corresponding hydraulic valve or electromagnetic valve, and said adjustable roller carrier further comprises an external electric hydraulic pump that drives said roller carrier hydraulic jacks. 
     
     
       5. The adjustable roller carrier according to  claim 1 , wherein each of said roller carrier hydraulic jacks is inside the hollow roller carrier base, the adjustable roller carrier further comprises an electric hydraulic pump inside the hollow roller carrier base, the electric hydraulic pump is connected to the roller carrier hydraulic jacks and a hydraulic valve inside the hollow roller carrier base, each of the roller carrier hydraulic jacks further includes a contactor or electromagnetic valve, and the adjustable roller carrier further comprises a remote controller that controls the contactors or electromagnetic valves. 
     
     
       6. The adjustable roller carrier according to  claim 1 , further comprising roller carrier rail wheels on opposed ends of a bottom of the hollow roller carrier base, and a roller carrier rail wheel electric motor installed on each of said roller carrier rail wheels. 
     
     
       7. The adjustable roller carrier according to  claim 3 , wherein said driving roller rotation motor comprises a servo motor or frequency conversion motor with an encoder closed-loop feedback controller. 
     
     
       8. The adjustable roller carrier according to  claim 3 , further comprising roller carrier rail wheels on opposed ends of a bottom of the hollow roller carrier base, and a roller carrier rail wheel electric motor installed on each of said roller carrier rail wheels. 
     
     
       9. The adjustable roller carrier according to  claim 5 , further comprising roller carrier rail wheels on opposed ends of a bottom of the hollow roller carrier base, and a roller carrier rail wheel electric motor installed on each of said roller carrier rail wheels. 
     
     
       10. The adjustable roller carrier according to  claim 1 , wherein said adjustable roller carrier is a driven roller carrier. 
     
     
       11. The adjustable roller carrier according to  claim 4 , further comprising a remote controller that controls the external electric hydraulic pump. 
     
     
       12. The adjustable roller carrier according to  claim 1 , wherein rotating the roller bearing around the first shaft changes a height of a corresponding roller and a horizontal center-to-center distance of the rollers. 
     
     
       13. The adjustable roller carrier according to  claim 1 , wherein each said opposed end of the hollow roller carrier base is articulated with said roller bearing and said roller carrier hydraulic jack. 
     
     
       14. The adjustable roller carrier according to  claim 1 , wherein the restricted space is a tunnel.